Inspection and maintenance of air-conditioning thermostat

If the air conditioner does not run as usual, you have to do some tests. Moreover, you should check the electrical control system controls the protection and enforcement components, temperature control main selector switch. Here are a few common methods to check the thermostat.


First, the thermostat of the hot and cold dual

Using the same hot and cold temperature sensing bellows of control. Its failure to check the thermostat and general inspection method is basically the same, but it should be noted that you should also check hot and cold switching operation is sensitive, that is, turn on the compressor cooling circuit should be in the position, the heating should be in the ON position electric heater circuit. Electric air conditioner used in the thermostat, contact the control box has two sets of contacts mechanism (cold contact and thermal contact).

Second, the bellows or diaphragm thermostat

Symptom: temperature controller contacts since the ignition occurs after adhesion. Contacts are not automatically jump, the compressor can not stop.
How to repair: If disconnected. Show contact adhesion, available flat screwdriver to move the mechanical forced contact is open; if contacts can jump, Table H-month thermostat temperature range and low drift, adjustable temperature range adjustment screw clockwise.

The bulb on the refrigerator double door refrigerator (5 ~ lO ℃) within the measured temperature controller two-wire terminals are disconnected. 1. Symptom: Contact bad or burned, causing the circuit can not be turned on; frequent contact arcing motion adhesions, resulting circuit can not be broken; temperature refrigerant leak temperature chamber, causing the contacts can not lose control of its operation and the like.

How to repair: if not pass, may be temperature refrigerant leakage. Leaks can first visual inspection, the observed temperature sensor seal welding head is broken, whether the bulb is damaged and cracks, the temperature sensing tube bending Have marks, etc., and then release the bulb 30 ~ 40 ~ C's warm water, test contact is closed, if the contact is still closed. Temperature sensing agent showed temperature within the package has been completed leakage; if the contacts can be closed, then the bulb was removed from the water and place some time after contact and off at low temperatures, indicating thermostat range improper adjustment screw can be corrected by adjusting the temperature range, counter-clockwise l.

Two terminals being the thermostat knob, turn the opposite direction after a few times, with a multimeter R × l range measuring temperature controller on state, if the resistance value is very small, indicating that the contact normal; If the resistance is large, show contact poor contact.

fan coil unit thermostat

Third, the temperature-sensitive resistor

Temperature sensing control characteristic curve or characteristic table of values ​​to determine whether normal when thermistor aging, drift performance, namely when the corresponding relationship between temperature and resistance to change, should be replaced with a new thermistor sensor. Electronic thermostat or microcomputer-controlled air conditioner, are thermistor for temperature sensing element. Is a thermistor whose resistance changes with temperature significantly change elements. For an air conditioner return air temperature measured ten stand thermistor. Generally having a negative temperature coefficient characteristics: resistance value decreases with increasing temperature. Thermistor specific to a certain brand of deep space is used, its resistance changes with temperature characteristics are generally plotted in random specification chart for detection use can be detected under certain circumstances. Measured with a semiconductor thermometer and multimeter.

Fourth, the defrost temperature controller

The method is to detect the temperature sensing portion disposed corresponding to the temperature of the water or air. Measured with a multimeter two terminals is disconnected or turned on. You will know good or bad. Thermal bimetal thermostat is also used for anti-cold indoor side control. Defrost temperature controller is provided in the thermal-type air conditioner control circuit is designed for the switching element electromagnetic valve. Its temperature sensing tube in the outdoor heat exchanger coil on. When winter heating, the outdoor heat exchanger frost thickened the temperature falls below a set value. Defrost controller contact action. Disconnect the solenoid valve. So that the original heating cycle becomes refrigeration cycle. There are two common forms of structure: one is sensitive bimetal: one is ordinary thermostat.

What‘s the central air-conditioning thermostat

Central air conditioning is a host through the duct through the wind or cold water pipes connected to a plurality of different ways to control the end of the room in order to achieve the purpose of regulating the indoor air conditioned, and the temperature control in each room will need central air-conditioning thermostat to help us solve. Then, by me this decoration net Xiaobian together with the vast number of consumers and friends good look at these central air-conditioning thermostat.

Central air-conditioning fan coil thermostat designed to control development and design, widely used in heating, cooling, ventilation, etc. HVAC control. Fan speed can be controlled by adjusting the wind speed button to manually or automatically controlled to achieve the purpose of controlling temperature. Central air-conditioning thermostat is divided into two kinds of mechanical and electronic, divided by different liquid crystal display and adjustable. Central air-conditioning thermostat through the program editing, the application to control the actuator to sent mixed signals, so as to control air-conditioning fan coil and electric two-way valve purposes.

Is the temperature controller for controlling the temperature of air-conditioned room of electrical switching apparatus. Temperature controller controls the air conditioning in the room temperature range is generally 18 ℃ --28 ℃. Window air-conditioning temperature controller is based on common principles to promote the contact pressure of the pass and off. Its structure consists of a bellows, thermal package (test tube), eccentric, micro-switches and other components of a sealed sensor system and a signal power transfer system.

Control methods are generally divided into two types; one is the object to be cooled by the temperature change is to be controlled, the use of the vapor pressure temperature controller, and the other by the object to be cooled to the temperature changes are controlled, the use of electronic temperature controller. Thermostat is divided into:

Mechanical divided into: vapor pressure thermostat, liquid expansion thermostat, thermostat gas adsorption, metal expansion thermostat.

Wherein the vapor pressure thermostat is divided into: inflatable, liquid gas filling type and mixed type. Household air conditioners are in such a mechanical thermostat based.

Electronic divided into: RTD and thermocouple temperature control thermostat.

fan coil unit thermostat

Circuit system functions:

The role of air conditioning circuitry is to control the air conditioning system and multifunction normal operation to protect the compressor and fan motor running. Components of the circuit system are: temperature controller, thermal protection, master switch, run capacitor, fan motor run capacitor are fixed to the control box. Left single cold type air conditioner electrical circuit diagram. The role of the temperature controller is controlling the compressor start and stop.

Bright Best air conditioning is a chinese private group of companies established in 2012 and specialised in heating and air conditioning parts.Brightbest own the wide products include fan coil unit,valve( ball valve, brass ball valve,check valve,angle valve,air vent valve,stop valve,strainer valve),air conditioning stainess steel corrugated tube ,air conditioning thermostat and air curtains.

Brightbest is provided with quality certification according to ISO9001:2000 , SO14001:2004 ,CE and is strongly committed to customer satisfaction.

Our products have been exported to UK, France, Italy, Middle East, Australia,and Africa etc. Our development vision will keep on persisting in principle of practicability, pioneer and innovation, and research & develop more efficient, energy-saving, eco-friendly and safer products to make great contribution to Chinese & worldwide energy saving and emission reduction.

How to choose central air-conditioning thermostat ?

Central air-conditioning thermostat is designed to control the development and design of fan coil. Widely used in heating, cooling, ventilation and HVAC control. Fan speed can be controlled by adjusting the wind speed button to manually or automatically controlled, in order to achieve the purpose of keeping indoor heated. Today, Bright best air conditioning teach you how to choose a central air-conditioning thermostat.

Central air-conditioning thermostat divide mechanical thermostat and sub electronic thermostat two kinds. According to different display mode is divided into mechanical adjustment thermostat and LCD thermostat two kinds. Electronic temperature control, also known as liquid crystal thermostat. LCD thermostat by an electronic logic circuits for which the measured temperature and set temperature compared to the control end of the central air-conditioning fans, valves, etc., are widely used in hotels, office buildings, shopping malls, industrial, medical and other civil construction villa in particular, so controlled constant ambient temperature within the set temperature range.

air conditioning thermostat (three-speed switch )

 large LCD digital thermostat

                 

Central air-conditioning thermostat LCD advantages: 1, the appearance of Qianli, generous; 2, using SCM control technology, reliable performance, high control accuracy; 3, transformer power supply, safe and reliable.

The disadvantage of central air-conditioning thermostat LCD: mechanical thermostat relatively high cost.

Use: generally used to adjust the air-conditioned comfort places high requirements.

Advantages of central air-conditioning mechanical thermostat: Control is simple, less investment costs.

The disadvantage of central air conditioning mechanical thermostat: 1, the appearance of old, dull; 2, control accuracy is poor; 3, easy ignition (direct switching

Bright Best air conditioning is a chinese private group of companies established in 2012 and specialised in climate technology.Which it has expanded over the years to a wide spectrum of products and services for air conditioning,treatment and ventilation,as well as heating systems for both industrial and domestics sectors.

Brightbest own the wide products include fan coil unit,brass ball valve,corrugated tube ,air conditioning thermostat and air curtains manufacturers.

Brightbest is provided with quality certification according to ISO9001:2000 and ISO14001:2004 and is strongly committed to customer satisfaction.

Brightbest is commited to a point of reference for energy saving and environmental protection technologies in the frame of international directives.

Central air conditioner thermostat works

Central air conditioning in the regulation of the room temperature has an advantage over conventional air conditioning , and liked by many users..Central air-conditioning temperature control precision of the secret lies in central air-conditioning's thermostat.Air conditioner temperature controller is to control the air conditioning room temperature electric switchgear.Central air conditioner thermostat consists of both electronic and mechanical, different types of central air conditioning thermostat, works differently.Below we take a look at the different types of central air-conditioning thermostat works.

mechanical thermostat

Mechanical temperature control can be divided into the vapour pressure-temperature, liquid expansion thermostat, gas adsorption heating and expansion of metal type thermostat.Vapor pressure type thermostat which can be divided into gas and liquid gas filling and mixed type.Home air conditioning machines are dominated by this type of thermostat.Let steam pressure thermostat, for example the principle of mechanical thermostats.


Experts pointed out that when vapor pressure type thermostat bellows action effect in spring, spring tension is controlled by a knob on the Control Panel, capillary in air conditioning indoor air inhaled air inlet, return air temperature to react in indoor cycling.When room temperature rose to adjustable set of temperature , capillary and corrugated tube in the of sense temperature agent gas expansion, makes corrugated tube elongation and overcome spring of stretch put switch touch points connected, at compressor running, System refrigeration, until at room temperature and fell to set of temperature, sense temperature package gas contraction, corrugated tube contraction and spring with action, will switch placed disconnect location, makes compressor of motor circuit cut.This repeated action, so as to achieve the purpose of controlling the room temperature.

large LCD digital thermostat

electronic thermostat

Electronically divided into resistive heating and thermocouple thermostat.Here we have a resistance temperature controller as an analysis of the working principle of electronic thermostat.

Electronic temperature controller (resistive) is by means of electric resistance method of temperature measured by commonly used Platinum wire, copper, tungsten, and semiconductors (thermistor) temperature resistance, the resistance has its advantages and disadvantages.Home air conditioning sensor based thermistors.Therefore, in form when the thermostat, can be changed easily by selecting the appropriate thermistor temperature and working temperature.

Bright Best air conditioning is a chinese private group of companies established in 2012 and specialised in climate technology.Which it has expanded over the years to a wide spectrum of products and services for air conditioning,treatment and ventilation,as well as heating systems for both industrial and domestics sectors.

Brightbest own the wide products include fan coil unit,brass ball valve,corrugated tube ,air conditioning thermostat and air curtains manufacturers.

Brightbest is provided with quality certification according to ISO9001:2000 and ISO14001:2004 and is strongly committed to customer satisfaction.

Brightbest is commited to a point of reference for energy saving and environmental protection technologies in the frame of international directives.